The GtkRadiant sources as originally released under the GPL license.

setup/quickstart.txt

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+Some info for a good transition from Q3Radiant 202 to GtkRadiant:
+
+- shortcut keys are now in shortcuts.ini
+    the syntax has changed a bit, no spaces between the '='
+    see shortcuts.sample
+- no longer using the registry, settings are stored in radiant.ini and savedinfo.bin
+    in Radiant directory
+- project settings templates:
+    the project settings file format has changed a bit.
+    it has version information now, and the setups come with a new quakev2.qe4 file
+    the project files are true templates, Radiant will read them and then store actual
+    project settings it uses in baseq3/scripts/user0.qe4 user1.qe4 etc.
+- new compilation monitoring
+    GtkRadiant comes with a modified version of q3map that reports to GtkRadiant through
+      the network. You get the output of q3map in the console window. And the compiling
+      errors can be processed (currently it detects leaks)
+- sleep mode:
+    before running Quake 3 Arena to playtest your maps, you can put Radiant to sleep:
+    manually with File > Sleep command
+    automatic if you compile and set "Activate sleep mode when running the engine"
+
+known issues:
+- View n2&3 crashes on sleep mode